mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2022

15 December

There are 3 even numbers between 3 and 9.
What is the only odd number \(n\) such that there are \(n\) even numbers between \(n\) and 729?

Show answer & extension

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

expansions advent products ellipses averages odd numbers shape even numbers quadrilaterals colouring division gerrymandering wordplay integration geometry algebra trigonometry symmetry sum to infinity books consecutive numbers crosswords star numbers squares sequences area square roots cryptic clues numbers grids polygons irreducible numbers probability arrows albgebra folding tube maps planes factors tangents indices circles percentages calculus bases chalkdust crossnumber cubics chocolate people maths logic remainders games doubling the only crossnumber mean cube numbers lines time geometric means binary determinants median perimeter integers elections polynomials prime numbers tiling addition pentagons digits money decahedra palindromes scales factorials 2d shapes means axes perfect numbers multiples routes dice clocks partitions geometric mean hexagons rugby number dodecagons spheres consecutive integers digital clocks dates surds parabolas proportion floors multiplication regular shapes chess ave quadratics neighbours 3d shapes cryptic crossnumbers square numbers christmas coins matrices dominos triangle numbers numbers volume combinatorics differentiation functions sport tournaments graphs square grids grids triangles unit fractions medians menace balancing powers sums coordinates probabilty cards taxicab geometry shapes pascal's triangle digital products range sets complex numbers crossnumbers rectangles angles fractions speed

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025